"You have to call murder, murder, even if it's from the cops," he added.

Quentin Tarantino continued to push back against his critics on Bill Maher's show. (HBO)

The pair went on to say that neither of them believes that all cops are bad but that there are institutional issues that need to be addressed.

"It's a hydra, it's a snake with many heads," Tarantino said. "But the biggest head that needs to be chopped off first is this blue wall idea. The fact that they will protect their own as opposed to put themselves at the betterment of citizenry."

"But they're not dealing in a fair issue. They're saying that I am a cop hater, which is slander cause I didn't say that. They're implying that I meant that all cops are murderers and I wasn't," Tarantino said Friday.

Maher said he empathized with the "Pulp Fiction" director, comparing Tarantino's brouhaha with the police to the flak he received for his own controversial comments after 9/11.

Maher was fired from his ABC show "Politically Incorrect" in the aftermath of Sept. 11 for saying that the terrorists who flew the planes into the World Trade Center towers were "not cowardly."